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United States Patent | 5,701,961 |
Warner ,   et al. | December 30, 1997 |
A latching magnetic switch is utilized to activate a push to start nutrunner or the like wherein the magnetic latching switch is deactivated first by one magnetic pole and thereafter upon engagement with the work piece and compression of the spindle and opposite pole of the magnet is utilized to activate the tool.
Inventors: | Warner; Donald R. (Columbia Cross Roads, PA); McCallops; John A. (Sayre, PA); Estep; John M. (Granville Summit, PA) |
Assignee: | Ingersoll-Rand Company (Woodcliff Lake, NJ) |
Appl. No.: | 676022 |
Filed: | July 5, 1996 |
Current U.S. Class: | 173/15; 173/4; 173/217 |
Intern'l Class: | B23B 021/00; B23B 017/00 |
Field of Search: | 173/2,4,176,178,13,15,18,217 |
3616864 | Nov., 1971 | Sorensen | 173/176. |
4265320 | May., 1981 | Tanaka et al. | 173/178. |
4298072 | Nov., 1981 | Baker et al. | 173/15. |
4300282 | Nov., 1981 | Bunyea et al. | 173/15. |
4488604 | Dec., 1984 | Whitehouse | 173/178. |